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United States Patent | 5,666,443 |
Kumashiro | September 9, 1997 |
Image data of an original image in a prescribed pixel matrix is subjected to edge emphasis. On the other hand, a maximum and a minimum of the image data are detected. Then, values of the image data subjected to edge emphasis are limited between the maximum and the minimum to provide output data. Thus, edge emphasis can be performed without increasing noises even for hand-written characters of low densities.
Inventors: | Kumashiro; Hideo (Toyokawa, JP) |
Assignee: | Minolta Co., Ltd. (Osaka, JP) |
Appl. No.: | 291113 |
Filed: | August 16, 1994 |
Aug 24, 1993[JP] | 5-209376 |
Current U.S. Class: | 382/266; 358/447; 358/463; 382/275 |
Intern'l Class: | G06T 005/00; H04N 001/409 |
Field of Search: | 358/447,448,455,456,458,462,463,465,466,532,530 382/54,50,51,52,266,275,260,261,263,264,265,304 348/687 |
4786976 | Nov., 1988 | Takao et al. | 358/456. |
5060284 | Oct., 1991 | Klees | 358/465. |
5166810 | Nov., 1992 | Sorimachi et al. | 358/462. |
5231677 | Jul., 1993 | Mita et al. | 358/447. |
5262863 | Nov., 1993 | Okada | 348/687. |
5357353 | Oct., 1994 | Hirota | 358/530. |
Foreign Patent Documents | |||
63-3563 | Jan., 1988 | JP. |